Classes can be
declared as sealed by putting the keyword sealed before the class definition.
Sealed classes are used to restrict the inheritance feature of object-oriented
programming.so The main purpose of a sealed class is to take away the
inheritance feature from the user so they cannot derive a class from a sealed
class. One of the best usages of sealed classes is when you have a class with
static members. For example, the "Pens" and "Brushes"
classes of the "System. Drawing" namespace.
Example:-
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public sealed class
textSealedClass
{
// Class
members here.
}
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So when we defined
a class with keyword “Sealed” then we don’t have a chance to derive that
particular class and we don’t have permission to inherit the properties from
that particular class.
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Note:
1. A class, which restricts inheritance for
security reason is declared, sealed class.
2. Sealed class is the last class in the
hierarchy.
3. Sealed class can be a derived class but
can't be a base class.
4. sealed class cannot also be an abstract
class. Because abstract class has to provide functionality.
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